我正在尝试创建一个应用。我想在操作栏中将导航抽屉图标更改为后退箭头，当我打开片段并在单击片段中的后退箭头时返回主要活动使用以下代码 -
public class MainActivity extends FragmentActivity implements OnMapReadyCallback, ConnectionCallbacks, OnConnectionFailedListener,LocationListener{
DrawerLayout mDrawerLayout;
ListView mDrawerList;
@SuppressWarnings("deprecation")
ActionBarDrawerToggle mDrawerToggle;
String mTitle="";
private final String TAG = this.getClass().getSimpleName();
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
LatLng latLng;
GoogleMap mMap;
SupportMapFragment mFragment;
Marker CurrentMarker,NearbyPlace,FindMarker;
EditText editplace = null;
Button findbtn = null;
boolean firstRun = true;
private Boolean exit = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//for connectivity service
ConnectivityManager cManager = (ConnectivityManager) getSystemService(this.CONNECTIVITY_SERVICE);
NetworkInfo nInfo = cManager.getActiveNetworkInfo();
if (nInfo != null && nInfo.isConnected()) {
Toast.makeText(this, "Network is available ", Toast.LENGTH_SHORT).show();
AdView adView = (AdView)findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder()
//.addTestDevice("abc")
.build();
adView.loadAd(adRequest);
mFragment=(SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map);
mFragment.getMapAsync(this);
}
else{
Toast.makeText(this, "Network is not available ", Toast.LENGTH_SHORT).show();
Fragment newFragment;
FragmentTransaction transaction = getFragmentManager().beginTransaction();
newFragment = new NetworkCheck();
transaction.replace(R.id.content_frame, newFragment);
transaction.addToBackStack(null);
transaction.commit();
}
editplace = (EditText) findViewById(R.id.editplace);
findbtn = (Button) findViewById(R.id.findbtn);
setListnerOnWidget();
mTitle = (String) getTitle();
// Getting reference to the DrawerLayout
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.drawer_list);
// Getting reference to the ActionBarDrawerToggle
mDrawerToggle = new ActionBarDrawerToggle( this,
mDrawerLayout,
R.drawable.ic_drawer,
R.string.drawer_open,
R.string.drawer_close){
/** Called when drawer is closed */
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
invalidateOptionsMenu();
}
/** Called when a drawer is opened */
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle("Select a menu");
invalidateOptionsMenu();
}
};
// Setting DrawerToggle on DrawerLayout
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerToggle.setDrawerIndicatorEnabled(true);
// Creating an ArrayAdapter to add items to the listview mDrawerList
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
getBaseContext(),
R.layout.drawer_list_item ,
getResources().getStringArray(R.array.menu)
);
mDrawerList.setAdapter(adapter);
getActionBar().setHomeButtonEnabled(true);
getActionBar().setDisplayHomeAsUpEnabled(true);
// Setting item click listener for the listview mDrawerList
mDrawerList.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent,
View view,
int position,
long id) {
displayView(position);
// Updating the action bar title
String[] menu = getResources().getStringArray(R.array.menu);
mTitle = menu[position];
mDrawerLayout.closeDrawer(mDrawerList);
}
private void displayView(int position) {
// TODO Auto-generated method stub
Fragment newFragment;
FragmentTransaction transaction = getFragmentManager().beginTransaction();
switch (position) {
case 0:
newFragment = new Help();
transaction.replace(R.id.content_frame, newFragment);
transaction.addToBackStack(null);
transaction.commit();
break;
case 1:
newFragment = new ContactUs();
transaction.replace(R.id.content_frame, newFragment);
transaction.addToBackStack(null);
transaction.commit();
break;
case 2:
transaction.addToBackStack(null);
getActionBar().setTitle("IQWINER");
try
{
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("text/plain");
i.putExtra(Intent.EXTRA_SUBJECT, "My application name");
String sAux = "\nLet me recommend you this application\n\n";
sAux = sAux + "https://play.google.com/store/apps/details?id=com.iqwiner\n\n";
i.putExtra(Intent.EXTRA_TEXT, sAux);
startActivity(Intent.createChooser(i, "Choose an action"));
}
catch(Exception e)
{ //e.toString();
}
break;
case 3:
newFragment = new Suggestion_Address();
transaction.replace(R.id.content_frame, newFragment);
transaction.addToBackStack(null);
transaction.commit();
Log.e(TAG, "Suggestion Address button is clicked");
break;
}
}
});
}
private void setListnerOnWidget() {
// TODO Auto-generated method stub
OnClickListener listener = new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String location = editplace.getText().toString();
if(location!=null && !location.equals("")){
new GeocoderTask().execute(location);
}
}
};
findbtn.setOnClickListener(listener);
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mDrawerToggle.onConfigurationChanged(newConfig);
}
//for back button
@Override
public void onBackPressed() {
if(mDrawerLayout.isDrawerOpen(Gravity.START)){
mDrawerLayout.closeDrawer(Gravity.START);
}
else if(getFragmentManager().getBackStackEntryCount() > 1){
super.onBackPressed();
}
else{
if (exit){
finish(); // finish activity
}
else{
Toast.makeText(this, "Tap Back again to Exit.",
Toast.LENGTH_SHORT).show();
exit = true;
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
exit = false;
}
}, 3 * 1000);
}
}
}
我想在打开片段时将导航抽屉图标更改为后退箭头图标，当我单击后退箭头然后从片段返回主要活动时。
由于
答案 0 :(得分：0)
删除以下代码：
mDrawerToggle.setDrawerIndicatorEnabled(true);
// Creating an ArrayAdapter to add items to the listview mDrawerList
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
getBaseContext(),
R.layout.drawer_list_item ,
getResources().getStringArray(R.array.menu)
);
mDrawerList.setAdapter(adapter);
getActionBar().setHomeButtonEnabled(true);
getActionBar().setDisplayHomeAsUpEnabled(true);
// Setting item click listener for the listview mDrawerList
mDrawerList.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent,
View view,
int position,
long id) {
displayView(position);
// Updating the action bar title
String[] menu = getResources().getStringArray(R.array.menu);
mTitle = menu[position];
mDrawerLayout.closeDrawer(mDrawerList);
}
private void displayView(int position) {
// TODO Auto-generated method stub
Fragment newFragment;
FragmentTransaction transaction = getFragmentManager().beginTransaction();
switch (position) {
case 0:
newFragment = new Help();
transaction.replace(R.id.content_frame, newFragment);
transaction.addToBackStack(null);
transaction.commit();
break;
case 1:
newFragment = new ContactUs();
transaction.replace(R.id.content_frame, newFragment);
transaction.addToBackStack(null);
transaction.commit();
break;
case 2:
transaction.addToBackStack(null);
getActionBar().setTitle("IQWINER");
try
{
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("text/plain");
i.putExtra(Intent.EXTRA_SUBJECT, "My application name");
String sAux = "\nLet me recommend you this application\n\n";
sAux = sAux + "https://play.google.com/store/apps/details?id=com.iqwiner\n\n";
i.putExtra(Intent.EXTRA_TEXT, sAux);
startActivity(Intent.createChooser(i, "Choose an action"));
}
catch(Exception e)
{ //e.toString();
}
break;
case 3:
newFragment = new Suggestion_Address();
transaction.replace(R.id.content_frame, newFragment);
transaction.addToBackStack(null);
transaction.commit();
Log.e(TAG, "Suggestion Address button is clicked");
break;
}
}
});
并使用以下代码进行更改：
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
// This method will trigger on item Click of navigation menu
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
//Checking if the item is in checked state or not, if not make it in checked state
if (menuItem.isChecked()) menuItem.setChecked(false);
else menuItem.setChecked(true);
//Closing drawer on item click
drawerLayout.closeDrawers();
//Check to see which item was being clicked and perform appropriate action
switch (menuItem.getItemId()) {
//Replacing the main content with ContentFragment Which is our Inbox View;
case R.id.drawer_home:
txt_title.setText("Home");
Intent intent=new Intent(HomeActivity.this, HomeActivity.class);
startActivity(intent);
finish();
return true;
case R.id.drawer_artist:
txt_title.setText("Artists");
android.support.v4.app.FragmentManager fragmentManager=getSupportFragmentManager();
android.support.v4.app.FragmentTransaction fragmentTransaction=fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.content_frame, new ArtistsFragment());
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
return true;
case R.id.drawer_myplaylist:
txt_title.setText("My Playlists");
fragmentManager = getSupportFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.content_frame, new PlayListFragment());
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
return true;
default:
Toast.makeText(getApplicationContext(), "Somethings Wrong", Toast.LENGTH_SHORT).show();
return true;
}
}
});
修改
的xml：
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:elevation="4dp"
android:layout_height="fill_parent"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<include
android:id="@+id/tool_bar"
layout="@layout/toolbar"
android:layout_height="wrap_content"
android:layout_width="match_parent"
/>
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/home">
//Your layout
</FrameLayout>
</LinearLayout>
<android.support.design.widget.NavigationView
android:id="@+id/navigation"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
android:background="@drawable/bg_all"
app:itemIconTint="@android:color/white"
app:itemTextColor="@android:color/white"
app:theme="@style/list_item_appearance"
app:menu="@menu/drawer_menu" >
</android.support.design.widget.NavigationView>
</android.support.v4.widget.DrawerLayout>
答案 1 :(得分：0)
getSupportFragmentManager().addOnBackStackChangedListener(
new FragmentManager.OnBackStackChangedListener() {
@Override
public void onBackStackChanged() {
if (getSupportFragmentManager()
.getBackStackEntryCount() > 0) {
getSupportActionBar()
.setDisplayHomeAsUpEnabled(true); // show
// back button
mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onBackPressed();
}
});
} else {
// show hamburger
getSupportActionBar()
.setDisplayHomeAsUpEnabled(false);
mDrawerToggle.syncState();
mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
drawerLayout
.openDrawer(GravityCompat.START);
}
});
}
}
});
在mDrawerLayout.setDrawerListener(mDrawerToggle);